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  • Need solution for RD Sharma maths class 12 chapter 19 Definite Integrals exercise Very short answer type question 28

Need solution for RD Sharma maths class 12 chapter 19 Definite Integrals exercise Very short answer type question 28

Answers (1)

best_answer

Answer: \log _{e} 2

Hint: you must know the rule of integration

Given: \int_{e}^{e^{2}} \frac{1}{x \log x} d x

Solution:  Put \log x=t

\frac{d x}{x}=\mathrm{dt}

\begin{aligned} &=\int_{e}^{e^{2}} \frac{1}{t} d t \\\\ &=[\log \mid t]_{-e}^{e^{2}} \end{aligned}

\begin{aligned} &=[\log [\log x]]_{e}^{e^{2}} \\\\ &=\log \left(\log e^{2}\right)-\log (\log e) \\\\ &=\log (2 \log e)-\log (1) \\\\ &=\log 2 \end{aligned}

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